I come to the forums primarily for Car Wars player, so I'm always interested in more Car Wars (Q&A, previews of 6th edition, etc.).

Illuminati, Munchkin, and Ogre are my other three from the active product list.

Some other thoughts that might be interesting:

Do a segment on the MiBs.

A segment on some of SJG's older games that aren't actively in print might be interesting.

Some of the company's history. Ups and down, government raids, etc.

Games that didn't make the cut and why. A discussion of why some games SJG considered didn't make it to production would be very interesting. And/or what had to change in some games in order to make it into production.

Edit:
00:21 The central repository is Sean's brain. Braaaaain.
00:39 The implied setting also reminds of 3ed Fantasy Folk, one of my personal favorites.
00:44 Inventions (although I heard Ghostdancer's working on that) and Weird Technology are two areas that could easily be expanded
00:52 The "campaign frames" project would seem to be a natural for asking for submissions from several authors - something between a supplement and a Pyramid number
01:14 I would have liked to hear Steven introduce himself in more depth personally, but maybe that's just me